Wait...so a Laser Sight only provides a bonus to someone who has a +0 or negative to hit roll? Page 219 defines bonus as "bonus: A positive modifier to a die roll."

While 162 seems to have the passage that you are referring to "Equipment bonuses are limited compared to the bonuses granted by other effects. Generally, they do not stack with each other or other types of bonuses, only the highest bonus applies. Thus a hero with a high Protection bonus doesn’t get much, if any, advantage from wearing a bulletproof vest. The only exception to this is Strength-based weapons, and there are limits on them as well (see Melee Weapons, later in this chapter)."

Finally, Laser Sight says "A laser sight projects a non-damaging laser beam showing where the weapon is aimed. This grants a Accurate 1 to the weapon it’s attached, which grants a +2 bonus on attack checks with that weapon."

I don't believe that, it is just what came to my mind as I started reading the passage on 162. Thanks for the information FuzzyBoots!

Feats are fine, with Defensive Roll specifically stacking. I believe that Steve also OKed the Tough feat from Warriors and Warlocks. But yes, the idea is that Superman doesn't benefit from wearing a bullet-proof vest. And yes, that means that feats such as Throwing Mastery and Attack Specialization also apply to equipment, even if they're power-based. Oh, and Constitution, even Enhanced Constitution, stacks.

As for the Laser Sight, that's not considered to be a power either. And yeah, a +2 makes as much sense or more sense than the +1. Personally, I tend to allow Equipment to have up to 1 rank of Improved Critical or Accurate to model the idea that you have a particularly keen or accurate weapon, but I'm a bit loathe to go past that. After all, it is supposed to be mundane "off the rack" equipment.